Grain boundary sliding-migration of aluminum 〈110〉 Σ11 {113} symmetric tilt coincidence grain boundary and its interpretation based on the motion of perfect DSC dislocations

Fukutomi, Hiroshi; Kamijo, Taichi

doi:10.1016/0036-9748(85)90181-4

Cited by 59 publications

(24 citation statements)

References 7 publications

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“…Fukutomi et al performed high-temperature, constant-load tensile creep test on Al bi-crystals containing a < 110 > Σ 11 {113} symmetric tilt boundary [ 3 ] as well as boundaries that deviated slightly from the ideal orientation. [ 33 ] They observed that the deformation was dominated by the migration of the grain boundary with some sliding attributed to the movement of DSC (the lattice defi ned by the set of displacements that conserve the CSL lattice structure) dislocations.…”

Section: Discussionmentioning

confidence: 98%

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

Aitken¹,

Jang²,

Weinberger³

et al. 2013

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Room-temperature uniaxial compressions of 900-nm-diameter aluminum bi-crystals, each containing a high-angle grain boundary with a plane normal inclined at 24° to the loading direction, revealed frictional sliding along the boundary plane to be the dominant deformation mechanism. The top crystallite sheared off as a single unit in the course of compression instead of crystallographic slip and extensive dislocation activity, as would be expected. Compressive stress strain data of deforming nano bicrystals was continuous, in contrast to single crystalline nano structures that show a stochastic stress strain signature, and displayed a peak in stress at the elastic limit of ~ 176 MPa followed by gradual softening and a plateau centered around ~ 125 MPa. An energetics-based physical model, which may explain observed room-temperature grain boundary sliding, in presented, and observations are discussed within the framework of crystalline nano-plasticity and defect microstructure evolution.

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Section: Discussionmentioning

confidence: 98%

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

Aitken¹,

Jang²,

Weinberger³

et al. 2013

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“…However, since there are five variables for characterizing the geometry orientation of a single GB [1], it would be intractable to make an exhaustive exploration in this five-dimensional materials parameter space [4,5]. To better achieve this goal, it is usually helpful to start from a wellestablished structure model of GBs such as the coincidence site lattice (CSL) theory, and to choose GBs with low values and with low indexed boundary planes from preliminary studies [6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Shear responses of $[\bar{1}\,1\,0]$ -tilt {1 1 5}/{1 1 1} asymmetric tilt grain boundaries in fcc metals by atomistic simulations

Wan

2013

Modelling Simul. Mater. Sci. Eng.

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The shear response of the 3 [1 1 0]-tilt (11 5)/(1 1 1) and 9 [1 1 0]-tilt (1 1 5)/(1 1 1) asymmetric tilt grain boundaries (GBs) in fcc metals Cu and Al has been studied by atomistic simulation methods with the embedded atom method interatomic potentials and with a bicrystal model. It is found that the structure of the GBs studied can be well described by the coincidence site lattice (CSL) theory. Shear of these GBs at room temperature along eight different directions within the GB plane shows that these two types of GBs can transform between each other by the formation of a coherent twin boundary. The structure transformation of the GBs can also take the form of GB sliding, GB sliding-migration coupled motion, GB faceting, GB 9R structure formation, etc, depending on the shear directions adopted and the material involved (Cu or Al). The detailed structure transformation mechanisms have been analyzed with the aid of the CSL-DSC (displacement shift complete) theory. Several structure transformation paths adherent to these two types of GBs have been identified for the activation of the GB sliding-migration coupled motion. It is concluded that, although CSL-DSC theory can be applied to describe the sliding-migration coupled motion of the GBs studied, some other effects such as the shear direction within the GB plane and the bonding characteristics of the materials should also play a significant role in the shear response of these GBs.

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“…The functioning of the GB DSC dislocation mechanism for GB shear coupled migration has been justified in previous studies for many low Σ CSL GBs with both symmetrical and asymmetrical tilt characters 30 31 32 33 34 35 . While it could be hard to make a definite map of all the CSL GBs that can give shear coupled migration by the GB DSC dislocation mechanism in specific materials, one can still establish that there should be a considerable amount of such GBs distributed in the 5-dimensional geometry space of GBs (misorientation θ = [ θ x , θ y , θ z ], inclination φ = [ φ 1 , φ 2 ]) 22 .…”

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confidence: 88%

Bi-crystallographic lattice structure directs grain boundary motion under shear stress

Wan

Han

Chen

2015

Sci Rep

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Shear stress driven grain boundary (GB) migration was found to be a ubiquitous phenomenon in small grained polycrystalline materials. Here we show that the GB displacement shift complete (DSC) dislocation mechanism for GB shear coupled migration is still functioning even if the geometry orientation of the GBs deviates a few degrees from the appropriate coincidence site lattice (CSL) GBs. It means that any large angle GB can have a considerable chance to be such a “CSL-related GB” for which the shear coupled GB migration motion can happen by the GB DSC dislocation mechanism. We conclude that the CSL-DSC bi-crystallographic lattice structure in GB is the main reason that GB can migrate under shear stress.

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Grain boundary sliding-migration of aluminum 〈110〉 Σ11 {113} symmetric tilt coincidence grain boundary and its interpretation based on the motion of perfect DSC dislocations

Cited by 59 publications

References 7 publications

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

Shear responses of $[\bar{1}\,1\,0]$ -tilt {1 1 5}/{1 1 1} asymmetric tilt grain boundaries in fcc metals by atomistic simulations

Bi-crystallographic lattice structure directs grain boundary motion under shear stress

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